Not only does "fanny" mean "rear end" in the US, but it's considered a very innocuous, and even childish word. It's also antiquated, and not in wide use anymore, which should come as a relief to horrified Brits.

Another big one to change the name (and how it is used) is that if you wear it on the fanny, you set yourself up for a much greater chance of having it robbed blind by pickpockets (let's create a new term for specialized ones, "pickfannys") because they're so insecure, if you've not locked it somehow.

I've been known in the past to use one for carrying my wallet/keys/necessities to my reality while on runs, but not facing backwards. Thus, it'd more accurately be called ... well, let's not go there